[Bug 102931] New: Radeon : EDID Reading Incorrectly

[Bug 102931] New: Radeon : EDID Reading Incorrectly

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=102931

            Bug ID: 102931
           Summary: Radeon : EDID Reading Incorrectly
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.1.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: contrib@kliznoe.com
        Regression: No

When running get-edid | parse-edid with i2c-dev module loaded, It doesn't read
my monitor correctly. The EDID reads fine with Windows and xrandr.

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[Bug 102931] Radeon : EDID Reading Incorrectly

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=102931

Alex Deucher <alexdeucher@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #1 from Alex Deucher <alexdeucher@gmail.com> ---
IIRC, get-edid doesn't actually probe any i2c buses, it uses vm86 to do vbe
calls to the vbios.  vbe will only provide the edid for whatever monitor it
happened to probe at boot and likely won't work correctly once a real driver is
loaded.  It's also not multi-head aware so if you have multiple monitors
attached or are using a different display than what was available at boot it
probably won't work.

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[Bug 102931] Radeon : EDID Reading Incorrectly

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=102931

--- Comment #2 from Alex Deucher <alexdeucher@gmail.com> ---
This is not a driver bug.  It's a limitation of get-edid.

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[Bug 102931] Radeon : EDID Reading Incorrectly

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=102931

--- Comment #3 from Maxqia <contrib@kliznoe.com> ---
Created attachment 185121
  --> https://bugzilla.kernel.org/attachment.cgi?id=185121&action=edit
get-edid | parse-edid output

According to the read-edid website and the program output, get-edid uses the
i2c bus.

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[Bug 102931] Radeon : EDID Reading Incorrectly

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=102931

Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |deathsimple@vodafone.de

--- Comment #4 from Christian König <deathsimple@vodafone.de> ---
get-edid calls into the BIOS directly to access the I2C bus and doesn't uses
the driver. With a kernel driver this is pretty much deprecated and shouldn't
be used any more.

Use the one provided in sysfs instead, try: find /sys -name "edid"

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[Bug 102931] Radeon : EDID Reading Incorrectly

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=102931

Maxqia <contrib@kliznoe.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |INVALID

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